Otolaryngology Book

http://www.fpnotebook.com/

Acoustic Neuroma

Aka: Acoustic Neuroma, Schwannoma
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  1. Pathophysiology
    1. Majority of lesions arise from vestibular branch CN 8
  2. Epidemiology
    1. Represents 8% of all Brain Tumors
    2. Represents 80% of posterior fossa tumors
    3. Otolaryngologists sued most on missed Acoustic Neuroma
  3. Signs
    1. Unilateral and persistent Tinnitus beyond 1 month
    2. Gradual unilateral Sensorineural Hearing Loss
    3. Episodic Vertigo presenting symptom in 10% of cases
  4. Diagnosis
    1. MRI brain with Internal Auditory Canals
    2. Audiology
      1. Audiometry
      2. Acoustic Reflex Testing
      3. Auditory Brainstem Testing (ABR)
    3. Electronystagmography (ENG)
      1. Abnormal in 50% of cases, but non-specific
  5. Management: Otolaryngology Referral for Surgical Excision
    1. Most otolaryngologists do not preserve hearing
    2. Hearing preservation technique has 50% success

Neurilemmoma (C0027809)

Definition (CHV) a benign tumor that originates from the nervous system
Definition (CHV) a benign tumor that originates from the nervous system
Definition (CHV) a benign tumor that originates from the nervous system
Definition (CHV) a benign tumor that originates from the nervous system
Definition (CHV) a benign tumor that originates from the nervous system
Definition (CHV) a benign tumor that originates from the nervous system
Definition (CHV) a benign tumor that originates from the nervous system
Definition (CHV) a benign tumor that originates from the nervous system
Definition (NCI) A benign, usually encapsulated slow growing tumor of the peripheral nervous system composed of well differentiated Schwann cells. It recurs infrequently and only rare cases associated with malignant transformation have been reported.
Definition (MSH) A neoplasm that arises from SCHWANN CELLS of the cranial, peripheral, and autonomic nerves. Clinically, these tumors may present as a cranial neuropathy, abdominal or soft tissue mass, intracranial lesion, or with spinal cord compression. Histologically, these tumors are encapsulated, highly vascular, and composed of a homogenous pattern of biphasic fusiform-shaped cells that may have a palisaded appearance. (From DeVita Jr et al., Cancer: Principles and Practice of Oncology, 5th ed, pp964-5)
Definition (NCI) A tumor of the peripheral nervous system that arises in the nerve sheath (protective covering). It is almost always benign, but rare malignant schwannomas have been reported.
Concepts Neoplastic Process (T191)
MSH D009442
ICD10 M9560/0
SnomedCT 189948006, 404022001, 985004
English Schwannoma, Neurinoma, Neurilemmoma, Neurilemmomas, Neurilemoma, Neurilemomas, Neurinomas, Neurilemmoma, NOS, Schwannoma, NOS, schwannoma, Schwannomas, neurilemmoma, neurinoma, Schwannoma (disorder), SCHWANNOMA, Neurilemmoma [Disease/Finding], Neurilemmoma NOS, Neurilemoma NOS, neurilemoma, neurinomas, neurilemmomas, ancient schwannoma, schwannomas, Benign Schwannoma, Schwannoma (WHO Grade I), Benign Neurilemmoma, Neurilemmoma (disorder), Neurilemoma (morphologic abnormality), Psammomatous schwannoma
Dutch schwannoom, neurilemoom, neurilemmoom, Neurilemmoom, Neurinoom, Schwannoom
French Schwannome, Gliome périphérique, Lemmome, Neurilemmome, Neurinome, Schwannogliome, Schwannome bénin
Italian Schwannoma, Schwannoma benigno, Neurilemoma, Neurinoma, Neurilemmoma
Portuguese Schwannoma, Neurilemoma, Neurinoma, Schwanoma
Swedish Neurilemmom
Japanese ｼｭﾜﾝｻｲﾎﾞｳｼｭ, ｼﾝｹｲｼｮｳｼｭ, シュワン細胞腫, シュワン腫, 神経線維鞘腫, シュワン鞘腫, Schwann腫, 神経鞘腫
Czech schwannom, neurilemom, neurinom, Neurilemom, Schwannom
Spanish Schwannoma, neurilemoma (anomalía morfológica), neurilemoma (trastorno), neurilemoma, neurinoma, schwannoma, Neurilemoma, Neurinoma
Finnish Neurilemmooma
Russian NEVRINOMA, LEMMOBLASTOMA, NEVRILEMMOMA, SHVANNOMA, LEMMOMA, NEIRILEMMOMA, ЛЕММОБЛАСТОМА, ЛЕММОМА, НЕВРИЛЕММОМА, НЕВРИНОМА, НЕЙРИЛЕММОМА, ШВАННОМА
Croatian Not Translated[Neurilemmoma]
Polish Nerwiak osłonkowy
Hungarian Neurinoma, Schwannoma, Neurilemmoma
German Neurilemmom, Neurinom, Schwannom
Sources
Derived from the NIH UMLS (Unified Medical Language System)


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